Added snakview.variations.Value.start/stopEditing()

startEditing() and stopEditing() should be triggered immediately instead of deferring those calls
to inside the draw() function. In draw(), there is no way to determine the dropValue parameter to
be submitted to $.valueview.stopEditing()

Bug: 70337
Change-Id: I066a53910ff899e535478a6ab1713eaf39151971
Merge "Added snakview.variations.Value.start/stopEditing()"